Method of forming bottle-caps



n. E BRUNS. METHOD OF FORMING BOTTLE CAPS.

APPLICATION FILED APR. 28. 1919.

1,333,750. Patented Mar.16,1920.

712 van Z57":

' RICHARD E. BRUNS, OF CHICAGO, ILLINOIS.

METHOD OF FORMING BOTTLE-CAPS.

Specification of Letters Patent.

Patented Mar. 16, 1920.

Application filed April 28, 1919. Serial No. 293,076.

b all whom it may concern."

.Be it known that I, RICHARD E. BRUNs, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Methods of Forming Bottle-Caps, of which the following is a specification. 1

My invention relates to a novel -method of producing a cap or seal for bottles.

One of the important objects in the invention here disclosed is to provide a method of producing a cap which shall possess the combined functions of a temporary and permanent closure for bottles in which liquids are directly dispensed to the consumer. Such bottles are employed to retain substances such ascatsup, chilli sauce, etc., and while I am aware that devices of this character in which a single thin sealing disk is employed have'been proposed, it

is and has been the practice for many years to employ a long, relatively expensive cork fitted in the choke ofthe bottle, the cap serving merely as a temporary closure after the cap has been removed.

The cap produced by my method combines the functions of'--a temporary and permanent closure and may be so cheaply constructed as to materially reduce the cost of sealing such bottles. This result is secured by so designing the parts that a mini mum of material is employed, the material being so disposed that none of it is wasted. This result has been secured only after long study and expensive trials anr'l experiments. The article produced is composed of the minimum number of parts and is manufacturedby a method which insures relative economy.

One of the important advantages of the present construction is in that the sealing disk which willpreferably be composed of cork, is mechanically held in proper relation to the cap. This serves to avoid any difficulties due to the uncertainty of the connection formed by adhesives. Furthermore, the cork disk is imperforate and there are no metallic parts in contact with any portion of the contents of the bottle;

A further advantage is that the device will effectually seal the bottle notwithstanding any irregularities in the top edge. The cork disk which I provide will be of such thickness and resiliency as to overcome any slight imperfections in the finish of the bottle and securely seal the contents thereof. This is possible only because of the fact that the disk is applied to the top edge of the bottle and is not rotated after having been seated thereon; there is therefore no grinding effect but a straight pressure, the screw-cap rotating on the anti-friction bead or rib provided on the upper surface of the disk container;- The rib or anti-friction of the bottle and therefore the clamping force is applied at exactly the right point.

Furthermore, the force is applied near the periphery of the cap and thus the metal employed in the cap may be of thinner gage than would be possible if the clamping force were applied at a point near the center thereof. Furthermore, the lateral bead being located directly above the end walls of the bottle permits of the deflection of the cork disk to a corresponding extent. Thus the disk is given a much greater area of contact with the bottle end than would be possible if such contact were secured only by distortion of the material composing the disk.

The method of my invention will be more readily understood by reference to the accompanying drawings, wherein,

Figure 1 is an elevation of a bottle cap applied to a bottle of conventional form;

Fig. 2 is an enlarged sectional view there- 1 upper terminal portion of which is curved in the usual manner, asat 12.

The closure comprises a metallic cap having an imperforate end wall 13, and side walls 1 1, the side walls beingstraight from the end wall to their terminal portions except for the inbe nt retaining flange 15, and the rolled threads 16. The sealing device comprises a non-metallic disk 17,- composed of cork or similar material. It is imperforate and is reinforced by means of-a meta'llic disk 18., having an inbent marginal flange 19, thereby providing an outwardly converging space into which the cork disk is forced. By' this means it is mechanically respondingly, as shown in Fig. 2, thus providing for a much greater area of contactor sealing surface than would otherwise be. possible. It also has the function of providing for a line contact with the end wall 1?), of

the ap, thus reducing frictional resistance and assuring that as the sealing device is forced into position by screwing the cap into place, the sealing disk will not. rotate with the cap. This assures that the seal will be perfect notwithstanding any slightirregularities in the end of the bottle.

In manufacturing the closure heretofore described, a blank of the proper shape is spun into tubular form, then the. metallic reinforcement is stamped to provide the lateral bead and the inbent marginal flange, after which the non-metallic disk is forced into engagement therewith. The sealing device is then located inthe inner end of the spun cap and the retaining flange or ring is rolled in the side walls thereof, thus permanertly securing the device in place. The threads may be simultaneously rolled or may be formed in a later operation as desired. -All the operations are performed by dies of the proper form and the closure may be produced with great economy.

Obviously the exact form of the device and the sequence of the steps in the method of producing may be changed without departure from the spirit. of my invention.

I claim:

1. The method of forming a bottle cap, which consists in spinning a blank into cupshape, then inserting a sealing disk therein, then rolling a retaining ring in the walls of said cup, then rolling threads in said walls, substantially as described.

2. The method of forming a bottle cap, which consists in spinning a blank into tubular form. then inserting a sealing disk therein. then rolling a. retaining flange in the walls of said tube near the inner end of said tubetsubstantially as described.

pressing a sealing disk into said flanged disk, then locating said reinforced sealing disk in the inner end of said cup, then forming a retaining flange in the side Walls of said cup, then forming threads in the side walls of said cup, substantially as described.

The method of producing a bottle'cap,

which consists in spinning a blank into tu-' bular shape having straight side Walls, then pressing a disk to form an inwardly converging marginal flange, then compressing a sealing disk into the space within said flange, then locating said sealing disk Within the inner end of said tube, then rolling a retaining ring in the side walls of the tube near the inner end thereof, then providing threads in said side Walls, substantially as described.

-(S. The method of producing a bottle cap, which consists in spinning a blank into tubular form having an end Wall and straight side walls, then stamping a disk toprovide a lateral groove near the periphery thereof, and a retaining flange, then compressing a sealing disk into engagement with said retaining flange, then rolling a retaining ring in the side Walls of said tubular member, then forming threads in said side walls, substantially as described.

7. The method of forming a bottle cap, which consists in spinning a blank into cupshape, then forming a sealing disk and providing a reinforcement therefor and cansmg said disk to be retained in intimate contact with said reinforcement, then locating said disk in the inner end of said cup, then rolling a retaining flange and threads in the side walls of said cup, substantially as described.

Signed at Chicago, Illinois, this 17th day of April, 1919.

RICHARD E. BRUNS.

W'itness:

'I. D. BUTLER. 

